I need to get the list of all genes associated with various biological system (for example 'circulatory system'). AFAIK, molecular biology databases are not annotated with information about 'biological systems' or is there any database that I am missing ? What could be the best way to find all genes of a particular system ?
what does it mean that a gene is associated with a biological system? Is that it is expressed in these organs? Or that it is required for those organs to work? Can you explain it better, please?
I define them as genes expressed in the organs of a given biological system.